A104



The Doepfer A-104 is a fourfold formant filter as used in the Mixtur Trautonium by Oskar Sala. It is made of four parallel resonance filters, each filter can be switched to low pass or band pass or off. Frequency, resonance and level are controlled for each filter separately (no voltage control). The frequency range for the filters is about 50Hz...5kHz. The filter audio inputs are very sensitive so that distortion may intentionally be used to create new sounds - if desired.

The A-104 is a versatile module for sound modification. In the first place it is used for reproduction of resonances (e.g. the vocal-like effects known from the Trautonium). In combination with the subharmonic generator A113, the Trautonium Manual A198 and some other A-100 modules one obtains a Trautonium replica.



This module has a maximum current draw of 50mA. It requires 20 TE/HP worth of space to fit in a Euro rack frame.